EP0720914A2 - Méthode pour optimiser la vitesse d'impression dans une imprimante par jet d'encre - Google Patents

Méthode pour optimiser la vitesse d'impression dans une imprimante par jet d'encre Download PDF

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Publication number
EP0720914A2
EP0720914A2 EP96300047A EP96300047A EP0720914A2 EP 0720914 A2 EP0720914 A2 EP 0720914A2 EP 96300047 A EP96300047 A EP 96300047A EP 96300047 A EP96300047 A EP 96300047A EP 0720914 A2 EP0720914 A2 EP 0720914A2
Authority
EP
European Patent Office
Prior art keywords
pixels
swath
image density
window
array
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96300047A
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German (de)
English (en)
Other versions
EP0720914A3 (fr
EP0720914B1 (fr
Inventor
Thomas P. Courtney
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xerox Corp
Original Assignee
Xerox Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xerox Corp filed Critical Xerox Corp
Publication of EP0720914A2 publication Critical patent/EP0720914A2/fr
Publication of EP0720914A3 publication Critical patent/EP0720914A3/fr
Application granted granted Critical
Publication of EP0720914B1 publication Critical patent/EP0720914B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
    • G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
    • G06K15/10—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by matrix printers
    • G06K15/102—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by matrix printers using ink jet print heads

Definitions

  • This invention relates to a method of determining image density for image data in the form of ON and OFF pixels, and to a method of controlling an ink jet printing apparatus based on the determined image density. More particularly, this invention relates to determining density of an image to be printed and optimizing printing speed and managing printed sheet ejection based on the image density.
  • Ink jet printers function by depositing droplets or dots of wet ink on a substrate in a predetermined pattern.
  • the patterns printed by such printers have become very sophisticated and complicated. For example, it is common for a printer to be instructed to print bar charts or other figures that have large solid fill regions.
  • ink jet printers have also been required to print at very high frequencies to increase the printing production.
  • the dry time required to dry such a region can be double the dry time required for text.
  • the invention includes a method of printing a swath of print data with an ink jet printer comprising storing print data as an array of ON and OFF pixels, determining image density for a swath of the stored print data, and controlling the printing operation of the swath based on the image density.
  • the image density according to this invention is determined by defining a window that encompasses the blocks of pixels in the array, positioning the window around successive blocks of pixels in the entire array, counting a number of ON pixels in each successive block, recording the number of ON pixels for each block, determining a maximum number of ON pixels in a block from the recorded numbers of ON pixels, and determining the image density for the swath of print data based on the determined maximum number of ON pixels.
  • a drying time required for each swath is determined and ejection of the printed sheets is controlled.
  • a maximum print frequency of firing of the ink jets is determined.
  • the invention provides an ink jet printing device that controls a printing operation based on image density comprising a memory that stores print data as an array of ON and OFF pixels, an image density determiner, and a controller that controls the printing operation based on the image density.
  • the image density determiner determines image density for a swath of stored print data and includes a filter that filters through successive blocks of print data in the array, a counter that counts ON pixels in each filtered block, and a computing mechanism that determines a maximum number of ON pixels for a block of print data in the array.
  • This invention is described with respect to an ink jet printing mechanism having a printhead that ejects droplets of wet ink. However, it is applicable to any printing mechanism that utilizes wet ink deposition. Further, the methods of determining density described herein are applicable to analyzing an array of any type of data.
  • Figure 1 shows a printing apparatus 10 having a printing head 12, a power source 14, a head driver 16, a motor driver 18, a spacing motor 20 and a CPU 22.
  • Printing apparatus 10 is powered by powered source 14 to drive printing head 12 via head driver 16 to eject ink droplets onto a printing medium.
  • CPU 22, which is a data processing apparatus such as a microprocessor, controls the printing process through head driver 16 and controls the printed sheet ejection through motor driver 18 and spacing motor 20.
  • CPU 22 includes a printing dot density determining section 24, a print frequency determining section 26, and a sheet ejection control section 28.
  • CPU 22 also includes standard ROM and RAM memories for storing print control programs and input print data.
  • Printing dot density determining section 24 determines the density of the image using stored print data as discussed in detail below.
  • Print frequency determining section 26 determines the maximum frequency at which an ink jet device may print a solid fill region.
  • most text less than 24 Pt and most graphics and halftones may be printed at frequencies 30% or more greater than frequencies at which solid filled regions may print. Solid fill regions suffer from reduced optical density and intermittent jetting at these higher frequencies.
  • a maximum print frequency for a swath containing for example text and solid fill regions may be determined.
  • the frequency is determined on a swath by swath basis to optimize overall throughput and maintain excellent print quality.
  • the frequency is controlled using conventional methods of varying the electrical pulse that causes the individual ink jets to eject a droplet of ink onto the substrate.
  • CPU 22 also includes a sheet ejection control section 28 that determines a dry time required per swath and controls sheet ejection based on that dry time. After a sheet is printed, sheet ejection control section 28 prevents a subsequent printed sheet to fall against any swaths whose dry time requirements have not been fulfilled. Therefore, smear and blotting are prevented between adjacent sheets in the output stack. Sheet ejection can be controlled by varying the maximum permissible scanning speed of the image to be printed or managing the page ejection by implementing page eject delays. In this embodiment, spacing motor 20 controls the sheet feed to delay ejection of a sheet until the required drying time has elapsed.
  • Spacing motor 20 includes a counter or timer such that a swath is printed and drying time is measured by decrementing the counter until drying time is satisfied. Then, the next printed sheet is ejected.
  • the timer can be set for each swath based on the contact zone of stacked sheets in the output tray. Preferably, the timer is set for each swath from the printing of a first page to the time at which a second page touches an area of the first page upon ejection. Any conventional sheet ejection control can be used with this invention.
  • Figure 2 is a flow chart that illustrates the steps of controlling the printing operation.
  • print data is input in step S1.
  • a dot pattern of the input print data is created in step S2.
  • the print data is arranged in an array of ON and OFF pixels.
  • the dot density is determined using an image density filter according to this invention.
  • the printing operation is controlled in step S4 by controlling the print frequency and/or the printed sheet ejection as described above.
  • the image density is determined by printing dot density determining section 24, which analyzes the print data stored in CPU 22. Basically, image density is dependent on the maximum number of pixels that fill a given two dimensional area within a swath.
  • a swath represents one pass of printhead.
  • Each ink jet within a printhead across a swath produces a raster, which is a line of printed data within a swath.
  • a filter analyzes the print data on a raster by raster basis as shown in Fig. 3A.
  • a window is formed at the upper left edge of an array of print data, which represents the top raster in a swath, as shown in Figure 3A.
  • the window has a size of n x 1.
  • n may be any integer, but, for illustrative purposes in this embodiment, n is preferably 48. For purposes of simplicity however, n is shown in Figure 3A as 5.
  • the n x 1 window begins at the left edge of the top raster. The number of ON pixels is counted.
  • the window then moves to the right, as shown by the dashed box in Figure 3A.
  • the window can be moved one pixel as shown or at greater pixel intervals, such as eight pixel intervals.
  • the number of ON pixels in this window is then counted.
  • the process continues across the array as shown in Figure 3A until the window reaches the end of the raster.
  • the maximum number of ON pixels found in a window is recorded.
  • the same procedure is used for each of the remaining rasters. For example, in a printhead having 128 vertically aligned ink jets that produces 128 rasters per swath, 128 values representing the maximum fill of any n x 1 window within each raster is recorded. These values are stored as a data array as shown in Figure 3B. For example, in an ink jet having an 128 vertically aligned jets, the data array of maximum numbers would be 1 x 128.
  • a second window is formed at the top of the array of maximum numbers.
  • This window has a size of 1 x m.
  • m is 48.
  • m is shown as 5.
  • the average for all the data within the second window is computed.
  • the 1 x m window is moved down the array calculating averages within each window as shown in Figure 3B.
  • the maximum average value is determined from the set of calculated average values.
  • the maximum average value is a representation of the maximum image density for that swath.
  • the print data is analyzed in a column format, as shown in Figure 4.
  • a window is also formed at the top left edge of an array of print data representing a swath.
  • this window has the size of p x 128, with 128 representing the number of vertically aligned ink jets.
  • the preferred value of p in this embodiment is 48.
  • p is shown in Figure 4 as 4. In operation, if p is too small, the dry time required for areas larger than p x 128 cannot be determined, which would require the assumption of the worst case dry time when in fact the dry time requirement is substantially less. Also, if p is too small, it is difficult to discern between double rows of small text versus one row of large text. It is unnecessary to make p substantially larger than 48 because the dry time requirement does not grow significantly for filled regions greater than 48 x 128.
  • the total number of ON pixels within the window p x 128 is counted.
  • the window is then incremented to the right and the total number of ON pixels is counted.
  • the window is incremented at eight pixel intervals to decrease the time required to determine density and to correspond to the recorded bits of information.
  • the window can be incremented one pixel at a time. The process continues across the swath until the p x 128 window reaches the right edge of the array. The maximum number of ON pixels found in any of the windows is determined. This value is a representation of the maximum density for that swath.
  • the maximum image density determined for each swath is then used to control the print frequency and sheet ejection as described above.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Ink Jet (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Electrophotography Configuration And Component (AREA)
EP96300047A 1995-01-03 1996-01-03 Méthode pour optimiser la vitesse d'impression dans une imprimante par jet d'encre Expired - Lifetime EP0720914B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/367,610 US5714990A (en) 1995-01-03 1995-01-03 Optimizing printing speed and managing printed sheet ejection based on image density and method of determining density
US367610 1995-01-03

Publications (3)

Publication Number Publication Date
EP0720914A2 true EP0720914A2 (fr) 1996-07-10
EP0720914A3 EP0720914A3 (fr) 1997-05-07
EP0720914B1 EP0720914B1 (fr) 2002-07-24

Family

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EP96300047A Expired - Lifetime EP0720914B1 (fr) 1995-01-03 1996-01-03 Méthode pour optimiser la vitesse d'impression dans une imprimante par jet d'encre

Country Status (6)

Country Link
US (1) US5714990A (fr)
EP (1) EP0720914B1 (fr)
JP (1) JPH08230178A (fr)
BR (1) BR9600007A (fr)
CA (1) CA2164891C (fr)
DE (1) DE69622441T2 (fr)

Cited By (6)

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EP0894639A1 (fr) * 1997-07-28 1999-02-03 Hewlett-Packard Company Copieur couleur
GB2364964A (en) * 2000-07-28 2002-02-13 Hewlett Packard Co Inkjet cartridge(s) which operates at continuous and non-continuous firing frequencies
WO2007017659A1 (fr) * 2005-08-08 2007-02-15 Inca Digital Printers Limited Commande d’imprimante à jet d’encre
US9731517B1 (en) 2016-07-29 2017-08-15 Hewlett-Packard Development Company, L.P. Printing device dryer setting
CN108367486A (zh) * 2015-12-11 2018-08-03 惠普发展公司，有限责任合伙企业 基于平面分区的密度分类器
US11040329B2 (en) 2017-03-17 2021-06-22 Hewlett-Packard Development Company, L.P. Density classifiers based on plane regions

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US6260938B1 (en) * 1996-04-23 2001-07-17 Canon Kabushiki Kaisha Ink-jet printing method and apparatus for printing with inks of different densities
JP3576694B2 (ja) * 1996-04-23 2004-10-13 キヤノン株式会社 インクジェット記録方法、その装置、画像処理方法及び画像処理方法を実行するプリント方法
JPH09286125A (ja) 1996-04-23 1997-11-04 Canon Inc インクジェット記録方法及びその装置
JPH11296046A (ja) * 1998-04-14 1999-10-29 Canon Inc 印刷制御装置および印刷制御装置の印刷処理方法およびコンピュータが読み出し可能なプログラムを格納した記憶媒体
JP2000127570A (ja) * 1998-10-27 2000-05-09 Canon Inc 画像形成装置、その制御方法、記憶媒体
US6257698B1 (en) * 1999-07-07 2001-07-10 Xerox Corporation Method of ink jet printing with varying density masking printing and white space skipping for faster paper advancement
US6149327A (en) * 1999-12-22 2000-11-21 Hewlett-Packard Company Method and apparatus for determining and controlling inkjet printing drying time
EP1125741B1 (fr) * 2000-02-17 2006-02-01 Sharp Kabushiki Kaisha Procédé et dispositif de formation d'image par jet d'encre
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JP2002200741A (ja) * 2000-12-28 2002-07-16 Sony Corp プリンタ
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US6550883B2 (en) 2001-08-24 2003-04-22 Hewlett-Packard Company Method and apparatus for controlling ink drying time in a hardcopy apparatus
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US7168784B2 (en) * 2004-03-30 2007-01-30 Hewlett-Packard Development Company, L.P. Formation of images
US20050219278A1 (en) * 2004-03-30 2005-10-06 Hudson Kevin R Image formation with a flexible number of passes
US8587825B2 (en) 2005-01-20 2013-11-19 Zih Corp Ethernet and USB powered printers and methods for supplying ethernet and USB power to a printer
US7287822B2 (en) * 2005-03-10 2007-10-30 Hewlett-Packard Development Company, L.P. Printing using a subset of printheads
US7300128B2 (en) * 2005-03-10 2007-11-27 Hewlett-Packard Development Company, L.P. Distributing print density
US7517042B2 (en) * 2005-03-10 2009-04-14 Hewlett-Packard Development Company, L.P. Delaying printing in response to highest expected temperature exceeding a threshold
US7185981B2 (en) * 2005-04-26 2007-03-06 Hewlett-Packard Development Company, L.P. Duplex printing
SG136862A1 (en) * 2006-04-21 2007-11-29 Oce Tech Bv Variable speed printing
JP5219638B2 (ja) * 2008-06-06 2013-06-26 キヤノン株式会社 インクジェット記録装置
US8136905B2 (en) * 2008-06-26 2012-03-20 Eastman Kodak Company Drop volume compensation for ink supply variation
US20090322806A1 (en) * 2008-06-26 2009-12-31 Donahue Frederick A Method of printing for increased ink efficiency
US8390829B2 (en) * 2008-09-30 2013-03-05 Eastman Kodak Company Inkjet printing method using print modes selected in response to image quality scores
JP5233881B2 (ja) * 2009-07-09 2013-07-10 ブラザー工業株式会社 画像データ処理装置及び液体吐出装置
WO2012154900A1 (fr) 2011-05-11 2012-11-15 Ricoh Production Print Solutions LLC Commande de séchoir dynamique lors d'une impression
US9460375B2 (en) * 2011-06-01 2016-10-04 Hewlett-Packard Development Company, L.P. Managing printer dry time
JP5875276B2 (ja) * 2011-07-29 2016-03-02 キヤノン株式会社 プリント装置
US20130077999A1 (en) * 2011-09-27 2013-03-28 Thomas Nathaniel Tombs Electrographic printer using fluidic charge dissipation
US8777394B2 (en) * 2011-09-27 2014-07-15 Eastman Kodak Company Inkjet printing using large particles
US20130077998A1 (en) * 2011-09-27 2013-03-28 Thomas Nathaniel Tombs Electrographic printing using fluidic charge dissipation
US8780147B2 (en) * 2011-09-27 2014-07-15 Eastman Kodak Company Large-particle semiporous-paper inkjet printer
US8840210B1 (en) * 2013-05-30 2014-09-23 Hewlett-Packard Development Company, L.P. Print system with variable print speed
US9789703B2 (en) 2014-10-31 2017-10-17 Seiko Epson Corporation Recording device and curl determination method
JP6554889B2 (ja) * 2015-04-15 2019-08-07 ブラザー工業株式会社 印刷データ作成装置及び印刷データ作成プログラム
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CN116490755A (zh) * 2020-10-22 2023-07-25 惠普发展公司，有限责任合伙企业 具有干燥延迟的打印模式

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0894639A1 (fr) * 1997-07-28 1999-02-03 Hewlett-Packard Company Copieur couleur
US6012792A (en) * 1997-07-28 2000-01-11 Hewlett-Packard Company Copier having full color high speed inkjet printer with two intra page printing speeds for controlling ink drying time for images having densely inked areas
GB2364964A (en) * 2000-07-28 2002-02-13 Hewlett Packard Co Inkjet cartridge(s) which operates at continuous and non-continuous firing frequencies
GB2364964B (en) * 2000-07-28 2004-01-21 Hewlett Packard Co Printing system that utilizes continuous and non-continuous firing frequencies
US9254699B2 (en) 2005-08-08 2016-02-09 Inca Digital Printers Limited Inkjet printer control
GB2429093B (en) * 2005-08-08 2011-04-13 Inca Digital Printers Ltd Inkjet printer control
WO2007017659A1 (fr) * 2005-08-08 2007-02-15 Inca Digital Printers Limited Commande d’imprimante à jet d’encre
CN108367486A (zh) * 2015-12-11 2018-08-03 惠普发展公司，有限责任合伙企业 基于平面分区的密度分类器
EP3386718A4 (fr) * 2015-12-11 2019-08-07 Hewlett-Packard Development Company, L.P. Classifications de densité sur la base de zones de plan
US10560584B2 (en) 2015-12-11 2020-02-11 Hewlett-Packard Development Company, L.P. Density classifiers based on plane regions
US9731517B1 (en) 2016-07-29 2017-08-15 Hewlett-Packard Development Company, L.P. Printing device dryer setting
US9962959B2 (en) 2016-07-29 2018-05-08 Hewlett-Packard Development Company, L.P. Printing device dryer setting
US11040329B2 (en) 2017-03-17 2021-06-22 Hewlett-Packard Development Company, L.P. Density classifiers based on plane regions

Also Published As

Publication number Publication date
EP0720914A3 (fr) 1997-05-07
EP0720914B1 (fr) 2002-07-24
JPH08230178A (ja) 1996-09-10
US5714990A (en) 1998-02-03
BR9600007A (pt) 1998-01-21
CA2164891C (fr) 1999-03-16
DE69622441D1 (de) 2002-08-29
DE69622441T2 (de) 2002-11-28
CA2164891A1 (fr) 1996-07-04

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